Also rename existing 'MSYS2' to 'MSYS2 (mingw-w64)'.
Closes #13915
*Rolling Release*
+- curl: https://github.com/msys2/MSYS2-packages/tree/master/curl
+- curl issues: https://github.com/msys2/MSYS2-packages/issues
+- curl patches: https://github.com/msys2/MSYS2-packages/tree/master/curl (`*.patch`)
+
+## MSYS2 (mingw-w64)
+
+*Rolling Release*
+
- curl: https://github.com/msys2/MINGW-packages/tree/master/mingw-w64-curl
- curl issues: https://github.com/msys2/MINGW-packages/issues
- curl patches: https://github.com/msys2/MINGW-packages/tree/master/mingw-w64-curl (`*.patch`)